There are a lot of changes but the most important are:

• COM support – now TextGRAB SDK provides COM interface. You can use it in any programming language which supports COM
• Improved documentation
• Example applications (C#, C++, VB.NET, Delphi, VB 6.0)

More information you can find on TextGRAB SDK page

You can download TextGRAB SDK 2.0 on following link:
http://www.renovation-software.com/files/tgsdk/TextGRAB-SDK-2.0-setup.zip